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In situ characterisation of dynamic fracture in $$Al_2O_3$$ using ultra-fast X-ray phase contrast radioscopy: effects of porosity and crack speed

Article dans une revue avec comité de lecture
Author
HENRY, Quentin
1002421 Institut de Mécanique et d'Ingénierie [I2M]
ccKOPP, Jean-Benoit
1002421 Institut de Mécanique et d'Ingénierie [I2M]
ccLE BARBENCHON, Louise
1002421 Institut de Mécanique et d'Ingénierie [I2M]
ccGIRARDOT, Jérémie
1002421 Institut de Mécanique et d'Ingénierie [I2M]
ccLUKIC, Bratislav
339765 European Synchrotron Radiation Facility [Grenoble] [ESRF]
ccCOHEN, Amitay
300759 Ben-Gurion University of the Negev [BGU]
ccCOSCULLUELA, Antonio
21150 Centre d'études scientifiques et techniques d'Aquitaine (CESTA-CEA) [CESTA]
ccVIOT, Philippe
1002421 Institut de Mécanique et d'Ingénierie [I2M]

URI
http://hdl.handle.net/10985/26066
DOI
10.1007/s10704-024-00816-0
Date
2025
Journal
International Journal of Fracture

Abstract

The dynamic fracture properties of porous ceramics were studied using single bunch synchrotron X-ray phase contrast imaging. The modified brazilian geometry was used to initiate and propagate a pure mode I crack. The specimen was compressed using the Split Hopkinson bars at strain rates of the order of 102s−1. Main cracks were isolated for four different grades of Al2O3, one dense alumina, and three porous grades with 20% to 60% porosity. The maximum measured crack velocities for three grades is of the order of 0.6 cR and 0.4 cR for the most porous. The fracture energy was estimated using a FE numerical simulation to quantify the influence of inertial effects induced by crack propagation. The results show that these inertial effects are far from negligible (up to 80% of the stored energy) and that the dynamic correction factors known from the literature tend to overestimate the fracture energy. The values obtained vary from 22 J/m2 for the densest to 5 J/m2 for the most porous.

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